CLEARFIL PORCELAIN BOND ACTIVATOR is a silane coupling agent, which in combination with SE Bond Primer or CLEARFIL LINER BOND 2V Primer, CLEARFIL NEW BOND or CLEARFIL PHOTO BOND guarantees a strong adhesion to porcelain and composite restorations. After mixing the liquids one can apply the mixture directly onto the surface to be restored followed by restoring the defect using a composite.